Support for drills.



y e. B. SIMMONS. SUPPORT FOR DRI LLS. APPLICATION FILED JAN.20, -19I5.

Patented Apr. 24, 1917.

cannot be UNITED STATES, PATENT OFFICE.

, GEORGE B. SIMMONS, or OTTUMWA', Iowa, Assrcnbn T0 AMERICAN MINING r001.

' COMPANY, or OTTUMWA, owa, A'conronarron or IOWA.

SUPPORT FOR DRILLS.

and useful Improvements in Supports for Drills, of which the following is a specification, reference beinghad to ing drawings.

My invention relates to drills used 111 coal the accompanymining and analogous situations, and has particularly to do with the supporting devices by which the drill is adjustably held in position for drilling. In coal mining, for example, it is common practice to mount the drill in a boxing which is connected to a sliding frame, commonly termed a chair, which is mounted to bars which are secured in position by pointed rods arranged to be projected at the opposite ends of the parallel bars so as to 'engage the floor or roof'of the mine, or other opposite fixed points. The position of the drill is-adjusted as may be necessary or desirable byslidingthe chair between the parallel supporting bars to the desired point and then securing it fixedly in position. Heretofore, the practice has'b een-to secure the chairin place by means of wedges, but this practice is objectionable because after the wedges have been secured, 'it is diificult to release them, and consequently the drill quickly adjusted. Furthermore, with devices of this character it is very desirable that means be provided by which the chair can be readily locked so as to prevent its 'movement in the direction of the thrust of the drill. For example, when the drill is directed downward, the tendency is to move the chair upward between the side bars,

whereas when the drill. is. directed upward, the tendency is to. move thechair downward,

and it is desirable that the locking mechanism be so constructed as to securely hold the chair against movement under the influence of such end thrust. The object of my invention is to provide a simple, compact and readily operable locking device for chairs of the character described, which will operate to secure the chair against movement, and particularly against movement under the influence of the end thrust of the drill, and which is so mounted that it cannot drop out of place. I accomplish this object as illustrated in the drawings and as Specificationof Letters Patent.

slide between parallel proved locking and in Fig. 1-1

Patented Apr. 24:, 1917.

', Application filed January 20, 1915. Serial 110. 3,379.

hereinafter described. That which I believe to be new is set forth in the claim. In the accompanying drawings,

. Figure 1 is a side elevation of a drill employing my improvements;

Fig. 2 is a front elevation of the chair; Fig. 3 is a side elevation thereof; Fig. 4; is a top or plan-view thereof; Fig. 5 is a viewshowing the chair mounted on theside bars;

Fig. 6 is an enlarged detail, being a longitudinalsection of one of the side bars and part ofthe'chair, showing the locking mechanism; -Fig. 7 is an edge view of the eccentric by which the locking is effected;

Fig. 8--is an end view thereof;

Fig. 9 is a side elevation showing'my imdevice applied to a drill support employing a single grip-bar instead ofapair of sidebars;

Fig. 10 is a plan view of the construction shown in Fig. 9, the grip-bar being in section.

' Referring 'to the drawings,

11 indicates the drill, and 12 the boxing in which it is mounted in the usual way. 13 indicatesithe'crank by which the drill is rotated.

14 indicates the chair to which the boxing 12 issecured in the usual way. Said chair comprises'two'side members l5-16 adapted to bear against the innersurfaces of parallel side-bars 17-18, which are preferably in the form of channel-bars, as shown in F ig.- 4,-said bars being, spaced a suitable distance apart 'and being adapted to be held in operative position by pointed rods 19-20, as shown in Fig. 1. One or both rods 19-20 may be arranged to be projected to engage opposite points of support, have shown a convenient method of providing for securing the sidebars 17 -18 inplace comprising the equipment of the upper rod 19 with screw threads, and mounting thereon a head 21 which may be rotated bya bar 22. The devices by, which theside-bars 17-48, which constitute the main support for the drill, may be secured in place form no part of my present invention, and any suitable arrangement for the purpose may be employed.

Theside members 15-16 of the chair 14 are provided with sleeves 23-24L which embrace the side-bars 1718 so as to hold the members 1516 in position. 25 indicates a bar connecting the two members 1516 of the chair together. As best shown in Figs. 2, 5 and 6, this cross-bar 25 is expanded at one end and is provided with a substantially semicircular recess 26, open at the side next to the adjacent side-bar, which, in the illustration, is the side-bar 18. Mounted in said recess is a roller 27 the central portion of which is in the form of a cam 28, as best shown in Figs. 7 and 8, said roller having a square central opening 29, or other convenient means by which it may be rotated. The cam 28 is of such shape and dimensions that it may be turned to a position entirely within the recess 26, or may be rotated in either direction to cause it to project beyond such recess into contact with the sidebar 18 before it reaches the point of its maximum projection, in the manner shown in Fig. 6. When the cam 27 is in its inoperative or neutral position, the chair 1 1 may be readily moved along between the side-bars 1718, but by turning said cam in either direction from its neutral position, it may be caused to engage the adjacent side-bar 18, and the chair be thereby firmly locked in a stationary position. It will be apparent that by this construction, if the end thrust of the drill is in an upward direction, tending to move the chair upwardly, the cam 27 would, in the illustration in Fig. 6, be turned in a clockwise direction to lock the chair in position; whereas, if the end thrust of the drill were downward, the chair would be locked by turning the cam in the opposite direction into operative position. By this construction the chair may readily be locked or unlocked, and as the open side of the recess 26 is closed by the side-bar 18, the cam roller cannot drop out. While in the construction shown the side members 1516 of the chair are provided with sleeves 23-24: which extend entirely around the side-bars 17-18, this is not essential, as all that is necessary is that the chair be so arranged as to prevent the cam 27 from forcing the side-bar 18 away from the member 16.

In Figs. 9 and 10 I have illustrated the same form of locking device applied to a diiferent type of chair used in connection with a square grip-bar. In the illustration in said figures I employ a chair 30, in the form of a fork having a sleeve 31 at the rear through which a square grip-bar 32 extends. Said sleeve is provided with a recess in which is mounted a cam-roller 33 similar to the roller 27 which is adapted to be rotated to bear against the surface of the grip-bar 32 in the manner already described.

That which I claim as my invention, and desire to secure by Letters Patent, is,-

A drill support, comprising a supporting member composed of two parallel bars, a chair having sleeves embracing said bars, and a cross-bar connecting said sleeves, said cross-bar having a recess adjacent to one of said bars, a rocking cam mounted in said recess and adapted to be rocked in either direction into engagement with the surface of the adjacent bar before it reaches its point of maximum projection, and means carried by said chair for supporting a drill.

GEO. B. SIMMONS.

Witnessesz HAROLD B. SIMMONS, A. M. LUKINS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner 0: Patents, Washington, D. C. 

